<template>
  <div class="login_container">
    <!--    头像区-->
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--      登录表单区-->
      <div>
        <el-form :model="loginForm" ref="loginFormRef" :rules="loginFormRules" label-width="0px" class="login_form">
          <!--          用户名-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
          </el-form-item>
          <!--          密码-->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-3702mima"></el-input>
          </el-form-item>
          <!--          按钮区域-->
          <el-form-item class="btns">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置表单
    resetLoginForm () {
      // console.log(this.$refs.loginFormRef)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async (valid) => {
        // console.log(valid)
        if (valid) {
          console.log('验证通过，发送登录请求')
          // 发送 http 登录请求
          const { data: res } = await this.$http.post('login', this.loginForm)
          console.log(res)
          // 验证返回数据，判断是否登录成功
          if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
          this.$message.success(res.meta.msg)

          // 若登录成功，则将token 存放在 sessionStorage 中
          window.sessionStorage.setItem('token', res.data.token)
          // 页面跳转到 home
          this.$router.push('/home')
        }
      })
    }
    // 1. token；将登录成功之后的 token，保存到客户端的sessionStorage中
    //   1.1 项目中除了登录以外的其他API接口，必须在已登录的状态才能够访问
    //   1.2 token只应该在当前网站打开的状态下才能生效，所以将 token 保存在sessionStorage中
    // 2.通过编程式导航跳转到后台主页，路由地址是 /home
  }

}
</script>

<style lang="less" scoped>
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 60px;
    box-sizing: border-box;
  }

  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #ffffff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .btns {
      display: flex;
      justify-content: center;
    }

  }

</style>
